Scheme 3.
Reagents and conditions: (a) NEt3, DCM, 30 min., 93% yield; (b) CuI(cat.), K3PO4, DMEDA (N, N′-dimethylethylene-diamine), toluene, degassed with argon (10 minutes), sealed, 110 °C for 3 h, 59% yield.
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